After you download / installed, you can define your passwords as below.TeamViewer icon >> Right click and choose Option >> Select Security to customized your passwords.

4. Prevent TeamViewer being turn-off during Windows' operation

Even though TeamViewer 7 will automatically enable after Windows reboot, there is also another function to prevent clients turning off the TeamViewer under Windows' operation.TeamViewer icon >> Right click and choose Option >> Select Advance >> Enable a feature called " Disable TeamViewer Shutdown "Once enable, users will NOT be able to close TeamViewer under Windows' operation.